Flask guide



Fatentecl Aug. 6, 1929.

UNITED STATES EDWARD 1?. ROTHAGKER, OF CLEVELAND, OHIO.

FLASK GUIDE.

Application filed November 14, 1928. Serial No. 319,262.

My invention pertains to a flask guide comprising a pin on the drag and a slide on the cope and which pin and slide are of zigzag contour in cross-section.

My many years of experience in the manufacture of foundry accessories has caused me to become familiar with all prior marketed constructions including a variety of flask. guides some of which correspond with the disclosure of some of the following list of domestic patents:

Boutelle, No. 522,959 of July 17, 1894; Jordan & Tyler, No. 951,495 of March 8, 1910; Eogenschutz, No. 956,621 of May 3, 1910; Schaumleflel, No. 986,223 of March 7 1828; Partridge, No. 1,106,674 of August 11, 1914; Bock, No. 1,458,206, of June 12, 1923; Seidel,

No. 1,108,630 of August 25, 1914; Deyette et al, No. 1,610,757 of December 14, 1926; Moore, No. 1,013,303 of January 2, 1.912; Coleman, No. 1,647,904 of November 1, 1927.

The objects of my successfully demonstrated improvement in design of a flask guide are i 7 1st. Accuracy of guiding so that the cope and drag Will properly and accurately register, without necessity for greasing and de spite entry of sand.

2nd. Ease of sliding so that a minimum of resistance shall be offered to the movement of the cope slides onthe drag pins.

3d. Strength, particularly of the drag pin so that it will not become broken due to the rough usage to which it is necessarily subjected.

4th. Provision of an unoccupied space at the bottom of one groove when pin and slide are interfitted. H a

My guide presents two types of surfaces to secure efficient guiding. The one type of surface is intended to prevent endwise motion of the cope with reference to the drag and the other type of surface is intended to prevent crosswise motion of the cope with relation to the drag. This is somewhat similar, for instance, to the disclosureof the Schaumleflel patent, but I provide amuch larger surface against lateral movement, thus insuring longer wear. The central Wide angle V is intended to prevent the outer surfaces from coming too tightly into contact so as to avoid the danger of binding.

Perhaps the closest prior art disclosure provides three Vs in its design, each V be ing substantially an isosceles triangle in cross-section, that is, both sides of the three groovesmake substantially the same angle with a perpendicular to the base. In my guide, the sides of the Vs in cross-section slope at different angles. Experience in practical use of that earlier triple groove device taught that continuous greasing is required to keep the parts moving freely one on the other, but greasing causes the ad.- hesion of sand to the grooves and sliding surfaces, thus causing rapid wear and sticking. Even aside of the greasing necessity, the sand easily gets into the numerous narrow bottoms of previous guide structures and quite diflicult to dislodge. gets into the bottoms of the grooves it causes sticking of the guides or even tilting and rocking, whereas my space unoccupied by metal permits the sand to fall out there. l-iowever, the converging surfaces in my guide are of Wider angularity and will therefore not even tend to become clogged with sand so easily and will clear themselves of sand more easily.

My design is much easier to machine and lit because the recesses are larger and need not be machined so accurately, hence is cheaper to manufacture. Earlier forms must achieve a more accurate fit to produce perfect guiding and this accurate fit is the inevitable cause of binding.

Corrosion also plays a very important part in maintaining the easy sliding surfaces and numerous small grooves are much more sub ject to damage from this corrosive action than are my wider ones. I accomplish the desired objects of a guide in two directions, but do so with larger Vs and. with only two Vs in the guide pin instead of three and incidentally obtain a stronger pin for the same amount of metal because my Vs are comparatively higher.

Adverting to the drawing:

, Figure 1 is a f 'agmentary end View of a foundry flask showing a portion of a cope resting upon a portion of a drag and held in proper alincment with respect to each other through the agency of a guiding appliance including a pin on the drag and a slide on the cope of the co-acting designembodying my invention.

Figure 2 is an cndwise or longitudinal median section on line 22 of Figure 1.

Figure 3 is a top plan view viewed on line 3-3 of Figure 2.

When sand Figure 4' is a horizontal section viewed on line 44 of Figure 2.

' Figure 5 is a fragmentary plan View of one end of a drag to which is attached a pin shown in section and embodying my improved design.

Figure 6 is a horizontal sectional detail of the pin-cooperating portion of the slide which is to be adjustably attached to the cope.

It is to be realized that the scope of my invention comprehends many equivalent constructions. The showing of the drawings and the particular description are merely a specific exemplification of a plurality of mechanical embodiments and arrangements.

Since the structure embodying this invention is duplicated at each end of the flask thesingular number may be employed. On a drag frame 1, usually of rectangular form, are secured'to each of opposite ends and near its upperedge a bracket 2. The bracket 2 r is secured by-a plurality of screws 3 and has projecting outwardly from it a "pair of con ventional lugs 4 which are to be gripped by the molders fingers or engagedby some part of a molding machine in order to raise the drag after the fiaskhasbeen inverted. Extending upwardly as'an integral part of the bracket 2 is an elongated pin 5 of approximate M-shape in cross-section as viewed from the middle of the drag.

An opposed, inner and angularly related pair of fiat surfaces 6 and 7 of the pin 5 define a'rather wide and slightly obtuse angle. The two distinct edges of the surfaces 6 and 7 terminate in ridges 8 and 9 from which also extend divergent flat surfaceslO and 11. It is particularly to be observed, and may be in Figure 5, that the surfaces 10 and 11 are steeper than the surfaces 6 and 7, which is-to say, form a different andlesser angle with the vertical plane which is perpendicular to the ends of the flask than the angle which the surfaces 6 and-7 form with such a plane. Also, it

should be noticed that the laterally remote pair of surfaces 10 and 11 extend'further toward the end of the drag than-do the surfaces-6 and 7 In other words, the bottom 12 of the interjacent groove, which is defined by the surfaces 6 and 7, is nearer the ridges 8 and 9'than are the two machined ends of the surfaceslO and 11 which are farthest apart measured crosswise of the "flask.

It is interpolated that the surfaces 6, 7, 10 andll are preferably machined to insure precision of fit or engagement with complementarilyrelated surfaceson a cooperating cope-carried slideto be next described. The pair of surfaces 6 and 7 are of substantially the same length as'the-pair of surfaces 10 and 11, but the latter pair converge more sharply than the former pair and the surfaces 10 and 11 intersect twoextreme lengthwise extending planes, which are further apart than the pair of cross-wise extending planes between which the surfaces 6 and 7 110.

A cope 13 has similarly secured to it, by means of screws 14;, a bracket 15 and the bracket is provided with an opening 16 through which the pin 5 may be inserted. A slide 17 is formed with a projecting flange 18 adapted to rest upon a supporting ledge of the bracket 15. One side of the vertically extending portion of the slide 17 is hollowed and composed of four surfaces collectively defining an approximate M-shape in crosssection, indeed, of corresponding size and shape to the zigzag contour of the pin The most remote pair of surfaces 18) and 2() correspond as to angularity and extent to the surfaces 10 and 11, whereas the two interjacent surfaces 21 and 22 correspond as to angularity, but not as to extent, with the surfaces 6 and 7. The surfaces 21 and 22 are of less depth by reason of a truncation 23 whereby a vertically extending space 2t is provided when the slide 17 is intcrlitlcd with the pin 5, as clearly appears in Figure 4. By thus shortening the extent of contact of the accurately machined surfaces 6 and 7 with the surfaces 21 and 22 which define the interjacent ridge of the side, an adequate duplex area of contact for preventing endwise motion is provided and yet the wide angle formed between said pairs of surfaces prevents the upper surfaces 1011 and l9-- 20 from coming too tightly into contart to occasion binding. The outer duplex engagement between the surfaces 10-ll and l2)-2() are primarily intended to prevent crosswise motion. lVIanifestly, if sand particles find lodgement on any of the machined surfaces their accuracy of engagement and a desired prevention of wobble might not be realized. \Vith my construction the space 24 allows for the gravitational escape of sand. A bolt and nut combination 25, shown in Figure 2, permits of adjustably securing the slide 17 with reference to the pin 5 in a manner not necessary further to describe, because old in the art and not herein claimed.

I claim In a flask-guiding appliance the combination of a pin secured to the end of a drag and a slide secured to the end of a cope, said pin and slide each approaching M shape in hori zontal cross-section, the pin being fashioned with an intcrjacent groove, the slide being fashioned with an interjacent ridge, the interjacent ridge on the slide being truncated whereby to preclude contact of it with the bottom of the groove in the pin to provide a Vertically extending space for the gravitational removal of sand.

Signed by me, this 19th day of October, 19 8.

EDWARD P. ROTHACKER. 

